Fix request ID problem

Question

Fix request ID problem

Andrew Rajcher 20

How to fix Request Id: e935f85f-1831-4c66-884f-2fe912c20900

Correlation Id: 3cd02645-74f8-4e4c-a7a1-259c6da7edbd

Timestamp: 2025-08-11T23:34:12Z

Message: AADSTS5000611: Symmetric Key Derivation Function version 'KDFV1' is invalid. Update the device for the latest updates. ''

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Answer 1

Thanks for reaching out. I am here to help.

Before we proceed, I'd like to confirm the following:

What Windows version and build number are you currently running? (Press Win + R, type winver)
When did this error start showing up, and has anything changed recently on the device? Like updates, software installs, and account changes?
Is this happening on just one device or multiple devices under the same account/tenant?
Are you signing in with a Microsoft 365 work/school account or a personal Microsoft account?
Is the device Azure AD-joined, hybrid-joined, or just using account sign-in without domain join?

This error usually means your device is trying to authenticate using KDFv1. It is a legacy cryptographic method that Microsoft no longer supports

You can also check this for reference

https://learn.microsoft.com/entra/identity/devices/deprecation-key-derivation-function-version-1

KDFv1 was phased out after a critical vulnerability, and since mid-2024, Microsoft has begun actively blocking it. Devices not updated past July 2021 builds are impacted.

Here are the steps that you can take to address this.

Step 1. Go to Settings > Update & Security, and install all updates.

If you're on Windows 10, ensure you're at least on version 22H2 or have applied equivalent security patches

Re-authenticate the account. Go to Settings > Accounts > Access work or school → Disconnect your account, restart your PC, then reconnect it

https://learn.microsoft.com/answers/questions/5491800/symmetric-key-derivation-function-version-kdfv1-is

Update Office apps

For New Outlook: From the Microsoft Store, go to Store > Library, then check for updates.

For classic Outlook: Open the app > File > Office Account > Update Options > Update Now

If you're an admin, monitor and enforce compliance

In the Microsoft Entra (Azure AD) portal, track sign-ins that return this error and target those devices for update

Please let me know if you still have questions or if you need help with any of the steps.

Cheers!

Answer 2

Hello Andrew. The error AADSTS5000611: Symmetric Key Derivation Function version 'KDFV1' is invalid means your device is attempting to use an old cryptographic algorithm (KDFv1) that Microsoft no longer supports for authentication. This most often affects older Windows builds, or if the device has not received any recent security patches.

To correct the issue, you should update your device to the latest version of Windows that is supported preferably Windows 10 22H2 or later, or Windows 11 with all cumulative updates installed. If you can't upgrade your OS version, you need to apply any security patches that are available for working in conjunction with the encryption libraries to allow the system to use a supported key derivation function, when Azure AD authentication is performed.

Here's the reference: Symmetric Key Derivation Function version 'KDFV1' is invalid

Best regards,

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Fix request ID problem

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